Cydia

In case you have been left out in the dark, Mobile Safari gained the Nitro JavaScript engine in iOS 4.3. The Nitro JavaScript engine in iOS 4.3 made Mobile Safari capable of loading JavaScript up to two times faster than Mobile Safari in iOS 4.2.1 could. One of the biggest beefs with third party Web browsers from Apple's App Store is that they lack this Nitro JavaScript engine because Apple doesn't allow the developers to tap into it.

If you’re a hardcore fan of iOS applications such as Facebook or Google Chrome, maybe it’s time you get some Nitro JavaScript love added into the mix to help increase your speed. A new jailbreak tweak called Nitrous by iOS developer Joe Jordan gives third party applications access to Apple’s Nitro JavaScript engine by adding the dynamic code-signing entitlement to third party applications.

Displayed above is a screenshot of the jailbreak tweak’s preferences pane, which can be found in the Settings application just after you install the tweak from Cydia. From the preferences pane, you can enable all of the third party applications you want to take advantage of the Nitro JavaScript engine. Turning them back off again will disable the Nitro JavaScript engine for the applications you turn off.

As shown above, the jailbreak tweak does increase your speeds by quite a good amount. The browser used in the example is Google Chrome for iOS and before installing the tweak, Google Chrome scored 11614.3 milliseconds in the SunSpider JavaScript benchmark test. After installing the tweak, the test benchmarked 3587.4 milliseconds, which is a substantial drop in loading time.

If you wouldn’t mind the extra performance boost that might help you load pages a second or two faster in third-party applications than the other guy, then you can grab Nitrous from the Cydia store right now for just 99¢.

After downloading and running the JavaScript tests on webkit.org I'm seeing a 75% increase in Chrome's JS speed, amazing! Chrome and Safari are now reporting almost exactly the same results, 2248 ms for Safari and 2247 ms for Chrome. Chrome's native speed without the tweak was 9098 ms. Definitively worth the $0.99!

This is literally the best thing ever (this month). Its like facebook already released their new improved version of the iOS facebook app. Really worth the .99c I was skeptical about paying any money at all for this, but now seeing the performance, I would have paid even more for this. The performance is as tangible as when moving from an iphone4 to a 4S.

I dont hope it gets fixed it better get fixed i just paid for this p.o.s

It's working very well here (and seems to be for plenty of others too). Perhaps instead of being a crybaby on a review you should send the dev an email (via Cydia including logs) and explain why you think this great tweak is a "POS"...?

He actually did not say anything or provide any information whatsoever. A trending idiotic thing to do on the internet is to quote other user statements with the word "this", indicating that they "agree" with a statement.